Evaluation of push-out bond strength of biological dentin post to root canal dentin when luted with four commercially available luting cements. an invitro study”

Background: The primary goal of any restorative treatment is to bring back the tooth to form and function. Teeth with severe coronal damage requires additional retentive steps to retain the core, postendodontically. Posts are an easy and reliable method to achieve additional retention and thereby increase the longetivity of the tooth. Endodontically treated teeth appear to have a better clinical outcome when adhesive methods and posts are minimally invasive. Although there are many commercially available post types, none fully satisfy the optimum biological and mechanical qualities. An innovative alternative strategy for the repair of a severely injured tooth is the use of biological post. Therefore the purpose of the study is to evaluate the push-out bond strength of biological dentin post to root canal dentin when luted with different luting cements.
Methods: Eighty single rooted teeth were selected and decoronated 14 mm from the apex of the tooth. The teeth were prepared and obturated, then divided into four groups of 20 samples each. The post spaces were prepared and biological dentin posts were cemented in group I with Type 1 GIC, in group II with Multilink N and in group III with Solocem and in group IV with Rely X U 200 luting cements. The specimens were sectioned into three slices of 3 ± 0.5 mm thickness to perform the push out test using universal testing machine. Thus, collected data was statistically analysed using one-way analysis. Multiple comparisons between the material groups and the position groups was made using TUKEY’S HSD post hoc test.
Results: The push out bond strength of group IV was significantly higher than that of group I , group II,group III and group IV (P < 0.05). No statistically significant difference was found between group I, group II and group III. There was significant difference between coronal, middle and apical thirds in groupII groupIII and groupIV.
Conclusion: Among the luting cements used, RelyX U200 offers superior bond strength at cervical middle and apical sections of the dentin post luted to root dentin. Self adhesive resin cements offer superior bond strength than conventional GIC, when luted with biological dentin posts. Further research has to be undertaken to consider biological dentin post as a viable alternative to conventional posts.